/**
 * Copyright (c) 2010 Andrey Somov
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.yaml.scalayaml.error

import org.yaml.scalayaml.scanner.Constant

case class Mark (name: String, index: Int, line: Int, column: Int, buffer: String, pointer: Int) {
    def getSnippet(indent:Int = 4, maxLength:Int = 75) = {
        if (buffer == null) null
        else {
            var head = ""
            var start = pointer
            var proceed = true
            var max = maxLength/2 - 1
            while (proceed && start > 0 && Constant.LINEBR.hasNo(buffer(start - 1))) {
                start -= 1
                if (pointer - start > max) {
                    head = " ... "
                    start += 5
                    proceed = false
                }
            }
            var tail = ""
            var end = pointer
            proceed = true
            while (proceed && end < buffer.length && Constant.LINEBR.hasNo(buffer(end))) {
                end += 1
                if (end - pointer > max) {
                    tail = " ... "
                    end -= 5
                    proceed = false
                }
            }
            val snippet = buffer.slice(start, end)
            val t1 = " " * indent
            t1 + head + snippet + tail + "\n" + " " * (indent + pointer - start + head.length) + "^"
        }
    }
}

